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x86/topology: Switch over to GENERIC_CPU_DEVICES

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Now that GENERIC_CPU_DEVICES calls arch_register_cpu(), which can be
overridden by the arch code, switch over to this to allow common code
to choose when the register_cpu() call is made.

x86's struct cpus come from struct x86_cpu, which has no other members
or users. Remove this and use the version defined by common code.

This is an intermediate step to the logic being moved to drivers/acpi,
where GENERIC_CPU_DEVICES will do the work when booting with acpi=off.

This patch also has the effect of moving the registration of CPUs from
subsys to driver core initialisation, prior to any initcalls running.

----
Changes since RFC:
 * Fixed the second copy of arch_register_cpu() used for non-hotplug
Changes since RFC v2:
 * Remove duplicate of the weak generic arch_register_cpu(), spotted
   by Jonathan Cameron. Add note about initialisation order change.
Changes since RFC v3:
 * Adapt to removal of EXPORT_SYMBOL()s

Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/E1r5R3l-00Cszm-UA@rmk-PC.armlinux.org.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
James Morse 2023-11-21 13:45:01 +00:00 committed by Greg Kroah-Hartman
parent 092cfbc6b5
commit 5b95f94c3b
3 changed files with 5 additions and 27 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
arch/x86/Kconfig
View file

@ -148,6 +148,7 @@ config X86
select GENERIC_CLOCKEVENTS_MIN_ADJUST
select GENERIC_CMOS_UPDATE
select GENERIC_CPU_AUTOPROBE
select GENERIC_CPU_DEVICES
select GENERIC_CPU_VULNERABILITIES
select GENERIC_EARLY_IOREMAP
select GENERIC_ENTRY

4
arch/x86/include/asm/cpu.h
View file

@ -23,10 +23,6 @@ static inline void prefill_possible_map(void) {}
#endif /* CONFIG_SMP */
struct x86_cpu {
struct cpu cpu;
};
#ifdef CONFIG_HOTPLUG_CPU
extern void soft_restart_cpu(void);
#endif

27
arch/x86/kernel/topology.c
View file

@ -35,36 +35,17 @@
#include <asm/io_apic.h>
#include <asm/cpu.h>
static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
#ifdef CONFIG_HOTPLUG_CPU
int arch_register_cpu(int cpu)
{
struct x86_cpu *xc = per_cpu_ptr(&cpu_devices, cpu);
struct cpu *c = per_cpu_ptr(&cpu_devices, cpu);
xc->cpu.hotpluggable = cpu > 0;
return register_cpu(&xc->cpu, cpu);
c->hotpluggable = cpu > 0;
return register_cpu(c, cpu);
}
void arch_unregister_cpu(int num)
{
unregister_cpu(&per_cpu(cpu_devices, num).cpu);
}
#else /* CONFIG_HOTPLUG_CPU */
int __init arch_register_cpu(int num)
{
return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
unregister_cpu(&per_cpu(cpu_devices, num));
}
#endif /* CONFIG_HOTPLUG_CPU */
static int __init topology_init(void)
{
int i;
for_each_present_cpu(i)
arch_register_cpu(i);
return 0;
}
subsys_initcall(topology_init);